Results 271 to 280 of about 537,997 (309)

Frequency diversity waveform with NLFM signals

2015 10th International Conference on Information, Communications and Signal Processing (ICICS), 2015
In this paper, we propose a frequency coding waveform with a nonlinear frequency modulation (NLFM) signal for the multiple-input multiple-output (MIMO) radar. The transmitted signal of each transmitting antenna is a pulse train, of which, the sub-pulses are NLFM signals with different carrier frequencies. The frequency sequence and the parameter of the
Caicai Gao, Kah Chan Teh, Aifei Liu
openaire   +1 more source

Frequency Diversity Antenna for WLAN Applications

2018 International Conference on Advances in Computing, Communications and Informatics (ICACCI), 2018
A novel frequency diversity antenna is designed for WLAN applications. Square ring slot is incorporated in ground plane for achieving the frequency diversity. The proposed antenna contains rectangular slots which are incorporated in square patch. RT duroid 5880 substrate is used for simulation purpose. Extensive simulations are performed in CADFEKO for
Ravindra K. Patil, Sohan S. Gurame
openaire   +1 more source

Accomodating Diversity in CMPs with Heterogeneous Frequencies

2009
Shrinking process technologies and growing chip sizes have profound effects on process variation. This leads to Chip Multiprocessors (CMPs) where not all cores operate at maximum frequency. Instead of simply disabling the slower cores or using guard banding (running all at the frequency of the slowest logic block), we investigate keeping them active ...
Major Bhadauria, Vincent M. Weaver, Sally A. McKee   +2 more
openaire   +1 more source

Joint Time and Frequency Estimation for Multicarrier Transmission with Frequency Diversity

IEICE Transactions on Communications, 2006
This letter proposes non-pilot-aided symbol timing and carrier frequency estimation methods in a multicarrier transmission system. To do this, multicarrier system uses a frequency diversity scheme over two consecutive data symbols with the combination of a cyclic time shift. Using the multicarrier signal equipped with frequency diversity, however, time
Hyun Yang, Young-Hwan You
openaire   +1 more source

The Feature Extraction of Time-Frequency Image Based on Frequency Diversity

2013 IEEE International Conference on Green Computing and Communications and IEEE Internet of Things and IEEE Cyber, Physical and Social Computing, 2013
In the process of actual radar observations, the influence of noise could inevitably generates breakpoint and induces defocusing in the time-frequency image of micro-motion target obtained by narrowband data, which leads to the inaccuracy of micro-motion feature extraction.
Jing Sheng, Zhihe Xiao, Jing Huang
openaire   +1 more source

Frequency diversity in multistatic radars

2008 IEEE Radar Conference, 2008
This paper presents the model and analysis of a frequency-diverse radar system. Multistatic radar systems provide an inherent spatial diversity by processing signals from different platforms which view a potential target from different aspect angles. By using different frequencies at each platform, an additional diversity gain can be obtained on top of
Byung Wook Jung, Raviraj S. Adve, Joohwan Chun   +2 more
openaire   +1 more source

Frequency diversity and its applications

International Journal of Satellite Communications, 1988
AbstractAdaptive shared resource methods may be the only available effective countermeasure to rain‐induced attenuation in satellite communication systems above 20 GHz. Two of these methods, frequency diversity (FDV) and burst length control (BLC) are examined and compared by using a unified approach.
F. Carassa, G. Tartara, E. Matricciani
openaire   +1 more source

MIMO Radar with Frequency Diversity

2009 International Waveform Diversity and Design Conference, 2009
We propose a new multiple-input, multiple-output (MIMO) radar system with colocated antennas that can greatly reduce target fluctuations. This is achieved by employing frequency diversity. The proposed MIMO radar system results in a radar array with frequency-division multiplexing that can also incorporate beamforming to design the transmission beam ...
Jun Jason Zhang, Antonia Papandreou-Suppappola   +1 more
openaire   +1 more source

Frequency Diverse Array Radars

2006 IEEE Conference on Radar, 2006
This paper presents a generalized structure for a frequency diverse array radar. In its simplest form, the frequency diverse array applies a linear phase progression across the aperture. This linear phase progression induces an electronic beam scan, as in a conventional phased array.
P. Antonik, M.C. Wicks, H.D. Griffiths, C.J. Baker   +3 more
openaire   +1 more source

The Frequency Diverse Bistatic System

2009 International Waveform Diversity and Design Conference, 2009
In this paper we analyze the Frequency Diverse Array (FDA), modifying some of its characteristics. Through a reconsideration of the organization of the array, which we termed “Wavelength Array” (WA), a new pattern, ‘orthogonal’ to the standard phased array, can be achieved.
P.F. Sammartino, C.J. Baker
openaire   +1 more source